Inventor: Bak, Elly, Steur, Nicolaas D. M.
Inventor: Bak, Elly, Steur, Nicolaas D. M.
Inventor: Bak, Elly, Steur, Nicolaas D. M.
Inventor: de Ruiter, Hendrik Marinus
Inventor: Hall, Elsie Kazerine
Inventor: Hall, Elsie Kazerine
Inventor: Hall, Elsie Kazerine
Inventor: Smith, Donald Robert
Inventor: Smith, Donald Robert
Inventor: Bak, Elly, Steur, Nicolaas D. M.
Inventor: Bak, Elly, Steur, Nicolaas D. M.
Inventor: Bak, Elly, Steur, Nicolaas D. M.
Inventor: Bak, Elly, Steur, Nicolaas D. M.
Inventor: Koning, Lammert
Inventor: Koning, Lammert
Inventor: Koning, Lammert
Inventor: Koning, Lammert